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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77e8c2c14a5ac2914a9cc5ce1fd9ef09c1976307c3153bceed2604057029c64' 
  AND token = 'P+0LmJsBQF1Cb6ftqGh8F7RHQ45IyGTo2sOA1k5EIB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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