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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca0d8d8e4b392a5ad0d407563ab55ca44fa94e007cae6bef95fb89b9a55d3f0' 
  AND token = 'rlHWHf4vlK7QfQkhW4Fe3xRO8dEX2Xim5ZuxCiQIAfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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