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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b270185222d60655c8736f1c7e23f3ed5816b842b47c6433617813cf4af428' 
  AND token = 'e4KpvxkcqzSg1J5gKj/jUenVWgNV6QcNX1GGO3/T7fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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