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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d9b75012f1a2c8f3913191c25dca7283c4ccecc8044b64796f0142ef8141c7' 
  AND token = 'TMhnqVKV/tw3LHG4cFD4drGmTRtW/fStO74oAJThMCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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