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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68be5cd4a8736bf22ac5c88d3f7bd547142c03e240f6b30d51c152c47511e66b' 
  AND token = '1FvLgME3EGhy5y0w6aJ0LbkXHym4V7QtUI4zVYJdueE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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