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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e3f5275ab2b3522d67464bcca16fe0fbff599de2f8837c907fdd4cfa0c51c27' 
  AND token = '1csUqmpFDCwo8c8ZbPiVle35jWcc8Ahlha1aY3/VmCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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