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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a430845f494067e80064e24d9ac8a28d4a25c43208a7333122d46ab6a3a95139' 
  AND token = 'AOwZpOUwAQDBkXhPEtPEUHlxU4fcE5ovjyQoPiD0iwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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