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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b86504e16d75dfd813d3d9ea6d695c944700ed643fcbf0fd6595a37f3581934a' 
  AND token = 'fl/qNYlhuImddtDypmrg+lcjOMz8gU6zy8VSGHyT2zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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