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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3adcb70f41686c8d00a72930f55f8a85177ec631a410a800aff6aadef535f56e' 
  AND token = 'CjJAuGhahaN7TVLkViJvknaucenQ57jaGwyrBll70oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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