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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d0d659c15c437edc670c14f823349f62f7852a8b95cd350b7cfe03aba4c836b' 
  AND token = 'm14QEuwCArgPmRnpifuP8j0PW3xXXSaBTzR9qPBr8Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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