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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd01bae44dbffcf4f79c6cfb458973f7ca5af6b3084671828c041a0b870691e2b' 
  AND token = '7ERWKt3j+FvLpN8La+/A2CfX70RNqtuv3GeUWkyYC5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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