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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '831b216a534f8dc69f30af5550107bf601ec5215eb9aeba82eacc138ba21865f' 
  AND token = 'gSE0e1BtSFP8mjM8nfRP85q3bWlvEOrZvWHi6mGxGCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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