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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f601c33fe2a3a4652d3a95b2a05dc5f69dd40f83cb9d991814ab9ba6bccec25' 
  AND token = 'hYc1ZAqYmgOyqTRcwikLh/jI1iEoeKZdBWLC449S9+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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