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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb178beb63aca1bc471d2ddf84c61aa909268253f87ce1b93cb069d6530a21b' 
  AND token = 'AE0YudFneNSRYMONFJWKdrlPJkUtnDJaPd6/mYOEypI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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