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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73e0d6bbfdd5f969e5ea246e21d668ae48474b176358c180724617de06281ae3' 
  AND token = 'j6AcX3J3BSZyQp2jKTGF41ScwdhWdQ2j0kLRtsXMSYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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