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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92699373e8b5c3601f2ee40bb48ca97a3f0e0bd2505b36db3fe391003e39cbd7' 
  AND token = 'KvDCmLCAhHGLgAi2zEe6NxW5yVOFjixFesyhofvaCzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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