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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b5f4121f59e662fb11f2c0e86ebdeeeeb4a2e901fe1ccabe75d40bf791c4a33' 
  AND token = 'K4htScpw5O0NwdGg8AjEhshCLXzAMEICjYA5JCrOyso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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