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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0ff3e7f9c396296e1da76ca821acd757ec61ba8faac4b976940c6f46ca99181' 
  AND token = 'h1f1bflzj+ym1V/LMkFMQXQb+h0rh967kXw9btJEoIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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