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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4befc85a447f2cf9be51520c90897a18725e96873c3c8be1bc38003e0bc8a39' 
  AND token = 'z7YC9NToHWH8tN2RFIAlkVxVSqhDcJBuHVXuGpw6/kE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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