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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b739ee7c710f1e7282ea5d20f58aec6943762b66855d65150813a290d81a8c' 
  AND token = 'D/Oi3kgZeDVgC1um2oxoP6yfIPOwbWVDa1dZm20cqIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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