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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da3808549a5d1f7d2bdfac5ecd6de9e1e671c984659da3ca58f6d3b56061dd94' 
  AND token = 'DNvtUoeHcIVjj3xttkqn8Vg0v61JPeMCwBnO2/FjBHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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