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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33b11664931e90ec8f7c2085341a187a08d3c7c2f50451885becf39948af1c03' 
  AND token = 'fgarDrPcBmqNj1J4XT+XlMHYDFV04zOTc4eA8SAHX/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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