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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83c95c58d3b5205467cedb35ecf1d8530c8493a78cfb9e121d63892f585de36a' 
  AND token = 'FlTZPSBg70MIvgXlOx68kkc5jcdma8pbl2E/h2mDkbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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