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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8305f7d45d9fa4f0ea24f4d15bce6f9f3f040ec2074fdca3a68600d7a5e4292f' 
  AND token = '/iIGxLUw7qBq6wmy1sEEhDxRGJqSp8hWSw/phJ438bQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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