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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa4319d0f70fc036aa23e4be829d8d505aebf4061e0dcc1e5c73a88ef4cec47f' 
  AND token = '9LYqB+eDGpUGVgXPke/nkaSF8Ku/s+FNt0EliBf5J4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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