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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7abea398f70ade52fd2cc8540bdcd940e904e51fcd48690966b9a1648d1be17' 
  AND token = 'V/0OmsEweiAkL5TQQ/FD/V5tNO4D/UbkwKwqKmdkFZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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