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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67fb1dad76f199d2b898d3eb0f9bcf0958fde3e2e89b80b2ae5310392948e547' 
  AND token = 'BjypU2jSoiGLARmH1zdS8idPl8XtvEyhst5DfI+kzAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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