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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '024550e5043e6549cc59dadd29f7b5d34609144de99ed4a69c0886f468b290ff' 
  AND token = 'AMWVt7lXZzlDEpSrCZk+olVW730SR6PY3mV6bE6xNo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}