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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '109aed4ec40f856613e5a1ac761fa26d1456f7a91ed57e19c24aba0af9f91a96' 
  AND token = 'yfmemajUkfih0Ew1T7ilRtoEjYEXbgH/aes5u+Vvvz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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