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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68a61f773c4440bfc10a174f932f5ab74cff0952df24e2dc8e4b2a586e16be3e' 
  AND token = 'qFFsl4o0EME5Fn38KO9JBIpvV1IX3p9NC5jzGAsH4yA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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