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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f69355141e5c67134fa1363c8f84091f2614e8ac26a0e67aecf81e9353e69838' 
  AND token = 'RB6oIIxvkkosvUci47XtKAUn0lL37YCTMgDe+4HsGUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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