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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba2ec9d82be0c26bab88c8bcc280c9df30ac2f0bc3c7f70c39e707fe12e6e0a8' 
  AND token = '9lVBJ4UPqmbWVtGtQWZo3QHQjoH26/fUnymPKsJn7VQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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