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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3864f0953e6053d34aec4e1c04c5353b11b04eb2521ee07db379cabaad170c3' 
  AND token = 'AJ6mY4eT1IRnkeGEKTIsNMU/rTLhEipwWo5DdsO8t0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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