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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53f86510a5a962aa35c3559ec6ceae80184963c58877d08e72181df7eb7afca' 
  AND token = '0u/ivikE4mU1aOeCR8rO44k42pQnNgL+ZXwGICjnto8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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