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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '393f7e364110d9a751a5b63f6fcc2dc88f97c94ffde9c41d3118209ba7b74216' 
  AND token = 'k0MuRRwZla7MXH50mwCQp5tVDK+34KUd4cwDwTP61r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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