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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4fbb2c0b46c078d850229878a6bfe3642e42a30c7c6cff1749f66e688cbd8c' 
  AND token = '5D3DiVoHaw+ACFslhbrjwO+F+tzsuRlRyff6zt2JmKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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