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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33bca504ded6b0b13d734f56eab411f125d2f7a349ef52a43cf061c02f4569db' 
  AND token = 'h2LYxMxKmIHKUROyU2N+5ur6oQlprkA2xzOTTqLSaOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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