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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cef809fea81717211e075afa29e208317b2f6cf6b88a082f708091a7fff4606' 
  AND token = 'g+nOedypjKEGrDqrFBWFiITE2DhLL/yf52rcanUEJvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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