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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438fccb3d786cb4e638b2e81fb7052738e58b20876d6c64faec4b323dcc8b691' 
  AND token = 'sfMLZ4WniF1BBckFr2PxJymBkpTIHPIi3DFOcQQ9m6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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