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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'deb039bc4505b178d53a415e36b0bf06735d35eebe44769aba79fcd08943eb16' 
  AND token = 'r/kiAsX0fFQTL5YmBHv1QihiP/HyH2iPHYLv45H9GDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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