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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2c978929aa5a9440cf726e509819411003507250944873d1a3956d7067d78b' 
  AND token = '8km98Ojj7DOYpsiLI12BSKOnPmH/gnU7Gtz28mtRZ3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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