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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb5e96230598efcf9740249db5c4b8df95e0f3af00962d9c1ddb4e35aba99602' 
  AND token = '8yREPbB9668A1z9ukOkehua87lPGCuz8yeZ7hJinqaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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