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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83f810c2bee1528215e455daca538cf60585e532163d7f039aec4e1afa2704c5' 
  AND token = 'UQX2haSV3CKZhHuU3uxruWW03NfB4j/nHknGfzv7d7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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