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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd97dee0c2a107ba3bef94bac8824808a0c08b2408226dcd39926c7dec090ae1' 
  AND token = 'o3KB+XUAXJ6iGrYJTzNOcHrSW8Luwlu/tlDyVr19br0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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