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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d5ac43d3719ad7d82dd0d681a1f0ab0524ddf50edf704da8cf86752ec72ca10' 
  AND token = 'OVWr4JbwR0bAW8vmAUib7FakZ6dFs9t1IqFB1P77HxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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