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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa818ddd8abff32b547d4f2ce5aa2125af520e146718b8ee0a270eac028376c7' 
  AND token = 'krTI2UaAM9/GmJUY7AQzJXaJ6aPzhDqg5+61a6rqgs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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