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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebf67811f151c19cee5f96bbe37ed80d1a5d757cac11588e218e4873301874b7' 
  AND token = 'W5X652NIw/lMpE/2SOYxbfKdGhJQHjgT7mh9ZgsbWHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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