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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd74bfff7410027f8f303a3f49b35789407404f9a5cce3cd45f0ecbd50045d5e' 
  AND token = '97WAFhKlzva+UR7ea8oqqX6/YGkC7N83GtbV6VNTEtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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