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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0eeb4851e417220c2571f5f46747d301cc6348f87f896af70b9aa172579f5c7' 
  AND token = 'ABQEN1NdVW66zKsH/5IbQiJHAG5ULeTbavF/lC4DH1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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