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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55fbb50f15bbc3f39ba45bd0a01a0edd7e8e614b77107fd12826662ae18a8797' 
  AND token = 'OSB5Wq8ROFw5pTP+9uf93fx2Zhp+ryJ6AkfeQr1wiqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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