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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ac316be610b12eb7064e175cc98897feb6ad5483c3fc8c22a0d9c033134eaa' 
  AND token = '3iQAPXof4pSZFNAwOxC0dI5t3Omz+ZZ0pYzZwqFxCUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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