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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c97cecff608b84ae692d627768b538eb0f635a8f004babad3910b48749744d49' 
  AND token = 'dI6fyHcLSUsgMYYxBcCA++IQX9qWrHpA7Oo5nCcOOio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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