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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dff990cab41c13ef9e6a5a68b786fab7938336aad0e0348ef5a4e91b1943cf63' 
  AND token = 'BoGnSNdI7Cd/x96ubqJ54JZ0YuXClV/QLxFHb4wv+c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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