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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1fc46e173f339d37e93918b5a3fb785989e2f16e9771abcf095ea4950184d9' 
  AND token = 'XzOg1f5Vrogolf++yCgAmFwBmKzSMkb9ozejDNnCMEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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