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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '504c6bce802da66baed02caa12f02c23eebcf50b5cd9b3090a61ec323751a85d' 
  AND token = 'baDpu4S8Wp/Khs+c+Xqdcyz12PC6vqbApZH4Do8CSwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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