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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14213fc9d33524312d67353b19949683fe940fa2f8e2a0f2be0ce599710c7be' 
  AND token = 'D3PrkH8Be2eBtYDkl3pX/ZOqB0fGnUBj2T9w5c/N9Qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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