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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c653e7a5e72b66ffcfa083e95edad328c59335946a44ae9ed5f579418a01cdc' 
  AND token = 'oamS/s/p+bgf5UDqlkYNS2ja4L7KWAx8OS7ybGfYEoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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