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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bf90c9eb9feac8365ba426ae2c10e9ae9c0bb5c573f5fdd7b510393c7b4ac8f' 
  AND token = 'FiE8z1TLl7EPBrFFNSc6qHykcGZp8wGKtJEAb/2P6cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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