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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97bd49ff94bb2e7021c7caec762495860b802d700e03807d99cc93be4da4e5bc' 
  AND token = 'Mh/4BTvfB/k1D+CTZNjynvSuX3pLtzfTlNPo4aLWI1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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