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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70d6526a7fa03d2ff360d4cc4d17d61ed1e60e7ea84ab37c75f3c0525b046977' 
  AND token = '55cgbcsVcCQIipiI0YViVum1wPPliJ+3jYCJcXWgwEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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