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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70da775aaab9e218580b6f931807660bb85a2f090e3f2697dfcbe1288c2fc68' 
  AND token = 'LlYMB3Rkv7I6J3fQi80cJtgn9bXU5oywlYFi3n5lvts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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