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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908e2a6c606c2a4ed540cba8cf9c9c73dc8c57f70a70dc92bc17d485a500d238' 
  AND token = 'SDq1wd6UgZ4ylS/VxNOKu5VOdWXf0+AnVm3+U5xQpMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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