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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd615ce6e2e4111c492e033d47b8c50fa47e19ec44ed0be2ac1ed6020cc36a8c6' 
  AND token = '5wQk/ngnks1rtvUc/KJI6URlpNRkjR9Kx9FwAnxsKfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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