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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcd02a8c92ef229b8097c9dbc82f119fcc8c8ada0f372d7be6b9328653c4129' 
  AND token = '/d3gQC9AfPq9T1jFKps7xh0MxVIKPdglPGFiuu1y0Vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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