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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ded2a9b40f2335ddda78d356bbc69d953b3b5d7470fd6272314b2e30f79e873' 
  AND token = '9kW0AG8zZIh95oTgso6cCWtM+QTBf/vj37N/qDFI4mU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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