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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fef5fed0928a2d98eff950c8c4c7c9da21434242122fef51097dead8a4794371' 
  AND token = '642P6AvB0NYjQOm3swiyvd+CzPeyCiCQ9nPydqmZOyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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